This study is being conducted to look at how the body handles the drug maraviroc. It will measure the amount of maraviroc in blood, semen, saliva and in the rectum of men. The aim is to understand how much of the drug (taken by mouth) reaches the oral, reproductive and intestinal tracts. It is believed that the presence of this drug in these areas may be beneficial in preventing the AIDS virus (HIV) from being passed from one person to another. The study will take samples of blood, saliva, semen and rectal mucosal tissue to measure drug levels. This study will also collect information on side effects.

A Phase IV, Open Label Study in Healthy Male Subjects to Investigate the Extent of Maraviroc Exposure in Blood, Saliva, Seminal Fluid, and Rectal Mucosal Tissue Following Single and Multiple Dosing of Maraviroc

Healthy male subjects between the ages of 18 and 49 years, inclusive, with intact genital tract and gastrointestinal tract. (Healthy is defined as no clinically relevant abnormalities identified by a detailed medical history, full physical examination, including blood pressure and pulse rate measurement, 12-lead ECG for individuals >35yo and clinical laboratory tests).

Body Mass Index (BMI) of approximately 18 to 30 kg/m2; and a total body weight >/=50 kg (110 lbs).

Evidence of a personally signed and dated informed consent document indicating that the subject has been informed of all pertinent aspects of the trial.

Willing and able to comply with scheduled visits, treatment plan, laboratory tests, and other trial procedures.

Subjects with a history of having a gastrectomy, colostomy, ileostomy, or any other procedure altering the gastrointestinal tract.

Subjects with inflammatory bowel diseases (ulcerative colitis or Crohn's disease) and have a clearly defined diagnosis of irritable bowel syndrome.

Subject who is unwilling to refrain from any sexual activity including intercourse and masturbation for 72 hours prior study visit Day 1 and until discharge from the study.

Subject who is unwilling to refrain from rectal insertion of medical/recreation devices and products and from receptive anal intercourse, for 72 hours before study visit Day -1 and through 7 days after the last biopsy unless instructed otherwise by the investigators.

Participation in a clinical study within 4 months preceding the first dose of trial medication.

Participation in a rectal biopsy study in the 12 months preceding the first dose of trial medication.

Use of prescription or nonprescription drugs, vitamins and dietary supplements within 7 days or 5 half-lives (whichever is longer) prior to the first dose of trial medication. Herbal supplements must be discontinued 14 days prior to the first dose of trial medication. As an exception, acetaminophen may be used at doses of </= 1 g/day

Blood donation of approximately 1 pint (500 mL) within 56 days prior to dosing.

History of sensitivity to heparin or heparin-induced thrombocytopenia.

Unwilling to abstain from alcohol use from 24 hours prior to the first dose of study medication until after the follow-up visit.

Unwilling to abstain from cigarette smoking completely during inpatient pharmacokinetic visits and unwilling to limit smoking to a maximum of 5 cigarettes per day from 24 hours prior to the start of the study until study completion.

Unwilling or unable to comply with the dietary restrictions in regard to study drug administration

Contacts and Locations

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study.
To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below.
For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00775294